User Guide

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20
GM500-U1G_A
Hardware Development Guide
V
IH
max = 2.1V
UART_CTS 56 DI Clear to send V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
UART_DSR 57 DO Data set ready V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
V
IH
max = 2.1V
1.8V power domain.
DO not pull-up external.
UART_DTR 58 DI Data terminal ready V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
V
IH
max = 2.1V
1.8V power domain.
UART_DCD 59 DO Data carrier
detection
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
UART_RI 60 DO Ring indicator V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
Debug UART Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
UART_DEBUG_TXD 68 DO Transmit data V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
It is strongly recommended to add test
point.
UART_DEBUG_RXD 67 DI Receive data V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
V
IH
max = 2.1V
1.8V power domain
It is strongly recommended to add test
point.
WLAN Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
WLAN_SLEEP_CLK 6 DO WLAN sleep clock V
OL
max = 0.45V
V
OH
min = 1.35V
Only supported by firmware with WiFi.
Other firmware, this pin is NC
COEX_UART_TX 7 DO LTE transmitter sync
for coexistence with
UART
V
OL
max = 0.45V
V
OH
min = 1.35V
Only supported by firmware with WiFi.
Other firmware, this pin is NC
COEX_UART_RX/USB_BO
OT
8 DI LTE receiver sync for
coexistence with
UART/Force boot fro
m USB interface
V
IL
max = 0.63V
V
IH
min = 1.17V
Only supported by firmware with WiFi.
Pull-up this pin to VREF_1V8 and then
power on the module, the module will
enter emergency download mode.
It is strongly recommended to add test
point.
WLAN_EN 12 DO WLAN enable V
OL
max = 0.45V
V
OH
min = 1.35V
Only supported by firmware with WiFi.
Other firmware, this pin is NC.
DO not pull-up external.
WLAN_3V3_EN 13 DO WLAN power enable V
OL
max = 0.45V
V
OH
min = 1.35V
Only supported by firmware with WiFi.
Other firmware, this pin is NC